Shitbael cottle



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S. COTTLE. Dies for MakingBr-aoelets.

INVENTOR Patented Feb. 15,1881.

WITNESSBS:

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' ATTORNEYS.

N-PETFRS, PHOTO-UYNOGRAPHER, WASHINGTON. D. C

"derives STATE PATENT FFIQEQ SHUBAEL OOTTLE, on NEW YORK, NY.

DIE FOR MAKING BRACELETS.

SPECIFICATION forming part of Letters Patent No. 237,823, dated February 15, 1881.

Application filed June 11, 1880.

To all whom it may concern Be it known that l, SHUBAEL Oo'rrLE, of the city, county, and State of New York.have invented a new and Improved Die for the Manufacture of Bracelets; and I do hereby declare that the following is a full, clear, and exact description of the same.

The methods heretofore pursued in the manufacture of fine band or parallel-sided gold bracelets involve so much care, skill, and time that their cost is high relative to the value of the metal entering into their structure and as compared with most other articles of gold jew-.

elry. The desired' perfection of construction and finish is, moreover, rarely attained, the semicircular parts of the bracelet tending to buckle or become otherwise distorted andirregular in shape while being burnished and otherwise manipulated in the process of manufacture, so that in the final finishing operation there are high parts that require to be taken off or cut away, which reduces the thickness of the metal unequally and impairs the strength, durability, and value of the completed article.

By use of a die constructed as hereinafter described I am enabled to produce band bracelets at less cost than heretofore, and with superior finish, strength, durability, and regularity of form.

In accompanying drawings, Figures 1 and 2 are respectively a perspective and sectional view of a half band or bracelet having the form in which it comes from the die shown in Figs. 6 and 7. Fig. 3 represents in perspective a tube from which a half-band is made and a mandrel inserted therein for the purpose of giving it the required shape preliminary to the operation of the die thereon. Fig 6 is a vertical section, on line at as, Fig. 7, of the die for shaping the half-band, the plunger being shown (in full lines) forced into the matrix or lower part of the die and resting on the half-band, which is compressed between them. Fig. 7 is a plan view of the matrix or receiving-die.

1 form each half of a band bracelet, Figs. 1, 2, from a tube which is either seamed or seamless, according to the desired quality of the article or the requirements of the trade. The first step necessary to produce the seamed tube is to form it from a plate by drawing the latter into the shape of a straight cylinder and then soldering its opposite edges in the usual (No model.)

way. Such cylinder or round tube is then drawn several times through drawing-dies and gradually reduced to the desired form in cross-section, which, as represented in Fig. 3, is that of the ordinary band bracelet. Previous to thelast draw, however, a square-edged mandrel, Y, is inserted in the straight tube to prevent buckling or other distortion of the parallel sides by the compressive action of the dies.

It will be observed that the seam is in the middle of one of the broad sides, Fig. 4, in place of being contiguous to the narrow sides, as usual.

Having thus obtained a tube, X, of the required form, I remove the mandrel and fill the tube with melted resin, lead, or other substance which may be found suitable for the purpose-that is to say, for preventing collapse under pressure. Such filled tube X is laid upon the matrix A, across the cavity of the same, as shown in dotted lines, Fig. 6, and then forced into the matriXAby means of the plunger B until the parts assume the position shown in full lines, same figure. The resin or lead filled tube thus receives the required shape without the least irregularity or imperfection in any particular.

In the case of the band made from a seamless tube the latter is formed by puncturing a plate of the required outline and proportions and then gradually drawing out the same into a cylinder, which is passed through drawing-dies until reduced to fiat shape, and subsequently manipulated or operated upon in the same manner as the seamed tube.

The plunger B may form part of a droppress or be operated in any other preferred manner.

Having thus indicated the best manner of preparing the half-band for the operation of the die in which my invention is embodied, I will now describe the die more in detail.

The receiving portion or matrix A consists of three principal parts-to wit, the fixed central or bed piece, a, and the removable side pieces, I) b. The piece a is a steel plate having flat parallel sides and the same width as the band or bracelet to be produced, and is preferably formed solid or in one piece with the horizontal base. The edges of the recess in such part a are cut sharp and true, and the tightly between the sides I) I) of the die A as to render its removal difficult and impracticable without distortion or other injury. Chietly for this reason the sides I) of the dies are made removable or separable from the center part, a; but when ahalf-band is to be shaped in the die the sides b are held firmly against the central part, a, as shown in Fig. 7. The means for effecting this are screws 0, workingin lugs *d, that form integral portions of thebaseof the die. Such lugs are arranged one diagonally opposite each corner of part a, and the screws bear upon the beveled ends of the sides 1). After the half-band has been pressed as required the screws 0 are operated to allow separation of one or both of the sides I) from the center part, a, so that the half band or bracelet may be lifted out. The sides bare then re clamped in their former position, and the die is in readiness for the operation on another flat tube.

In place of making one or both sides of the matrix removable, they may be fixed and the bed-piece a made movable instead, so that it may be raised or pushed up to effect the extraction of the half-band.

I do not claim, broadly, a die having one of its sides movable; but

What 1 claim as new is The improved die for manufacture of halfbands of gold bracelets, the same consisting of the matrix formed of the bed-piece a and the removable side pieces, I) I), having beveled outer corners and parallel inner sides, which are in contact with said part a, the adjusting and clamping screws 0, and the plunger B, which has a rounded lower edge and parallel vertical sides that adapt itto fit accurately in the cavity of the matrix, all as shown and described, for the purpose specified.

SHUBAEL COTTLE.

Witnesses:

AMos W. HART, SoLoN C. KEMON. 

